Say I bought 100 shares of WFC (then NOB) in 1987 for 17.75. (Because I did).
That is now 800 shares (three 2:1 splits) at $35.
Now I could sell 50 shares now and then the remaining 750 shares would be "free".
But what exactly is the point. The original $1775 that I invested in 1989 was already my money. The entire amount right now is my money. It is "free and clear" if you will. I would only sell it if I had a bette rplace to invest that part of my portfolio.
If I had sold 95% of those NOB in 1989 when they made their first little gain, I would now have 40 "free" shares of WFC. I'd rather have the 800.